Viessmann Vitodens 222-F B2TB, Application Manual

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35
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Vitodens 222-F
Application 4
Notes / Comments
1.
The (P3) circulator in Heat circuit 2 is controlled by the air handler.
2.
Heat demand contact from air handler must be a dry contact / potential free.
3.
The dry contact for the radiant heat circuit could come from a device such as a thermostat, zone valve, or multi zone controller.
Application Code
VD2T 2HC2T2ZP.01